Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1997-08-29
1999-08-17
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, G11B 5596
Patent
active
059402407
ABSTRACT:
The invention is a method of calibrating a position error signal (PES) to overcome the problem of a measured displacement or PES that varies as a non-linear function of real displacement when the read transducer is positioned to either side of a null position where the PES equals zero. The PES is notably nonlinear while reading servo burst information with a Magneto-Resistive (MR) head which has nonlinear magnetic characteristics. The method uniquely calibrates the measured PES to provide a corrected PES by measuring the PES while slowly moving the MR head at a constant radial velocity, determining the actual displacement corresponding to each measured PES, and comparing the measured PES with the ideal PES for the corresponding displacement to develop a correction table for providing a corrected PES when given a measured PES. The method uniquely relies on the standard servo burst data and may, therefore, be performed at anytime without need for a servowriter or any sort of special calibration track.
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Shara, Esq. Milad G.
Sniezek Andrew L.
Western Digital Corporation
Young, Esq. Leo J.
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